Changes to quarto docs

[clairblacketer]

These are items noted in PR #796 . That PR was pulled in as the mechanics work and these are cosmetic and other changes that should be made before releasing CDM v5.5

• link to annual symposia on background page to be updated
• update dates on the cdm refresh process page
• update CDM WG meeting information
• Remove links to google drive location on refresh process page
• Remove link to running agenda on refresh process page
• all links in documentation need to be moved to the CDM v5.5 pages when available
• A good task for 2027 would be to review all old documentation (from 2021) to make sure it still holds up and we agree with the message
  • For example the patient privacy article heavily refers to HIPAA, we need to add EHDS as well
• Patient privacy page references are in bibtext format, we need to figure out how to update these for quarto
• Custom concepts page - I think there is a poster from Roger we might need to add in there as reference
• The second and third columns in the CDM table descriptions need to be widened to accommodate the text better
• tooling support page needs correct emojis and all tables included -> to be updated for upcoming v5.5
• CDM additions - accepted changes needs either to be removed or a correct link
• update era table scripts (issue already open for this)

[MaximMoinat]

Good suggestions, turned them into checklist. This also makes it easy to create sub-issues if more discussion needed, like I did for the first item now.